Palo Alto's iconic El Palo Alto tree has been sprayed with graffiti by one or more vandals. The city's namesake tree, which is estimated to be about 1,070 years old, had black, white and green graffiti on the western side of its trunk on Thursday afternoon. The railing separating El Palo Alto Park, where the tree stands, from the adjacent Caltrain tracks was also covered in white graffiti. Most of the graffiti was illegible, though the words "nail-gun" were sprayed on El Palo Alto's trunk. Photo by Veronica Weber/Palo Alto Online.